Influence of heat treatment on microstructure and nanohardness of TiAl alloy solidified under high pressure

被引：0

作者：

Dongdong Zhu ^{[1
,2
]}

Duo Dong ^{[1
]}

Jieren Yang ^{[3
]}

Li Liu ^{[1
]}

Xiaohong Wang ^{[1
]}

Yuanxiang Zhang ^{[1
]}

Zunjie Wei ^{[2
]}

机构：

[1] Key Laboratory of Air-driven Equipment Technology of Zhejiang Province, Quzhou University

[2] School of Materials Science and Engineering, Harbin Institute of Technology

[3] State Key Laboratory of Solidification Processing, Northwestern Polytechnical University

来源：

China Foundry | 2020年 / 17卷 / 06期

关键词：

D O I：

暂无

中图分类号：

TG146.23 []; TG156 [热处理工艺];

学科分类号：

080502 ; 080201 ; 080503 ;

摘要：

The Ti-48at.%Al alloy solidified under different pressures was prepared using a tungsten-carbide six-anvil apparatus and then heat treated at different temperatures.The effect of heat treatment on microstructure and mechanical properties of high pressure solidified Ti-48Al alloy was investigated.The results showed that the phase constitution of the Ti-48Al alloy solidified under high pressure did not change after heat treatment.After 1,100 °C/12 h AC （air cooling）,the value of c/a showed a slight increase.The Widmanst?tten structure was formed in the samples solidified under 2 GPa and 4 GPa.More defects were found in the high-pressure samples.The volume fraction of α2 particles increased with an increase in pressure.After 1,150 °C/4 h AC,the discontinuous coarsening phenomenon could only be found in the 4 GPa solidified samples.The formation of α2 phase can lead to the increase of nanohardness.Compared with the samples before heat treatment,the nanohardness increased about 1.0-1.2 GPa.

引用

页码：435 / 440

页数：6

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